I apologize for not reading this entire thread and only being a casual observer of this mess. I have a question about the Republicans line of defense that does not make sense to me.
It would appear they had two distinct paths they could follow for defense, but they had to choose only one. It appears to me that they may have chosen the wrong one. Please correct me if they are pursuing both paths simultaneously which would be even more odd.
Defense 1: There was no Quid Pro Quo, white house visits or delivery of US military aid were not conditioned on Ukraine announcing or starting a corruption investigation.
Defense 2: There was a Quid Pro Quo but it was for legitimate purposes.
Some associated ideas:
Trump had taken a position early on that he did not want the US to be the world's policeman (this must have really ticked off John Bolton) or the world's unconditional candyman when it came to foreign aid. Using Quid Pro Quo for foreign aid is not a new idea. Several current Democratic candidates have suggested using a Quid Pro Quo: military aid for stopping settlements in the West Bank.
It seems it would have been an easier road trying to show the legitimacy of the object of the Quid Pro Quo. Russian/Ukrainian corruption has been a long time concern of the State department and previous administrations. Asking Ukraine to check out a specific situation in a known corrupt company to see if there was corruption was certainly better than asking for approval of one of his golf course resorts.
Back to the West Bank example. What if Elizabeth Warren (who could be part Palestinian, who knows) was President and wanted to implement the military aid for stopping settlements in the West Bank Quid Pro Quo. If she had family or property interests in the West Bank would she have to stop and say: I'm sorry Palestinians, you will have to wait another 4 or 8 years for this action, it would not be proper for me to do it?
I want to stress that I am not blindly supporting one side or the other. What I have stated here is from my low-information ignorance and I am trying to learn. Thanks for your help.